I have designed a linked model named Shiftdate as:

class Shiftdate(models.Model):
    shift_date = models.DateField(blank=False,unique=True)
    sit_date = models.ForeignKey(Sitting,
                                on_delete=models.CASCADE)

Using this model I changed sit_date to shift_date which is like: 

Sitting Date     Shifting Date2016-09-01       Sept. 15, 20162016-09-08       
Sept. 19, 2016


Now I need to save this shifting date to the Sitting date as sit_date in 
Sitting model. My Sitting model is:

class Sitting(models.Model):
    sit_date = models.DateField(blank=False,unique=True)
    cut_off_date = models.DateField(null=True, blank=True)
    ballot_date = models.DateField(null=True, blank=True)
    sess_no = models.ForeignKey(Session,
                                 on_delete=models.CASCADE)
    genre = TreeForeignKey('Genre', null=True, blank=True, db_index=True)


I use 

def get_shift_date(self):

            return self.sit_date=self.shift_date 

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